The show has been doing so poorly on Syfy that they are going to just burn off the remainder of the series (6 episodes) in one day during a 13-hour marathon of the series, instead of airing the show normally through August as originally planned. They are doing the same with Sinbad.

The Primeval: New World marathon will be on August 10, 10AM-11PM, with the "new" episodes starting at 5PM.

I think it's safe to say that the possibility of the show continuing is now extinct.